Exchange 2010 mailbox database size limits

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I am going to start a migration from and Exchange 2003 cluster to a new Exchange 2010 SP2 with 14 mailbox databases of a supposed maximum size of about 400 GB each. Each database will be divided into 2 LUNS, data and transaction logs. LUN size takes into account to leave about 20% of free space to avoid monitoring alerts. As mailboxes will be distributed randomly during migration, how can I be sure that 400 GB database size limit will not be exceeded? And after migration, as mailboxes will grow time by time, how to make Exchange respect database size limits?
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I am starting to migrate about 1000 user mailboxes from an Exchange 2003 cluster to a new Exchange 2010 SP2 and I'm trying to figure out how to set mailbox size limits based on user roles. My idea is to divide users into 3 roles by Active Directory groups, High usage (1 GB limit), Medium (512 MB limit) and Low (256 MB limit).

how do i increase the size of my exchange database this morning in logged in and the first storage group had been dismounted so i mounted it again with no problems. I went to check event Viewver and i got this message

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